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We recommend to start creating your expression using the following CRON expression generator: https://www.freeformatter.com/cron-expression-generator-quartz.html.
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The resulting expressions of this generator may differ slightly from the
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syntax in Custom Notifications.
Please use the text feedback below the CRON expression field in Custom Notifications to finalize your expression according to your requirements!
Further information about CRON can be found here: http://www.quartz-scheduler.org/documentation/quartz-2.3.0/tutorials/crontrigger.html.